If I follow MGMs football rules, if the game is played within a week and at the same venue as originally location, then a straight up bet like Over is honored. If it’s a SGP, then game must be played within 48 hours of originally scheduled game. So long as game is played tomorrow, at least of MGM, I believe any Over bets are still good. On the other hand, everyone that was hammering the Under would be stuck with those bets too.
Not sure what the rules are elsewhere, but they’re likely similar.